MAGETWO-54937: Investigate and if possible implement more detailed error message logging

Author: Oleksandr Iegorov

lib/internal/Magento/Framework/Css/Test/Unit/PreProcessor/Adapter/Less/ProcessorTest.php

@@ -96,6 +96,9 @@ public function testProcessContentException()
             ->with($assetMock)
             ->willThrowException(new \Exception(self::ERROR_MESSAGE));
 
+        $this->loggerMock->expects(self::never())
+            ->method('critical');
+
         $this->temporaryFileMock->expects(self::never())
             ->method('createFile');